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<pre><span class="sourceLineNo">001</span>package com.github.sarxos.webcam;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>import java.io.File;<a name="line.3"></a>
<span class="sourceLineNo">004</span>import java.io.IOException;<a name="line.4"></a>
<span class="sourceLineNo">005</span>import java.net.URL;<a name="line.5"></a>
<span class="sourceLineNo">006</span>import java.util.ArrayList;<a name="line.6"></a>
<span class="sourceLineNo">007</span>import java.util.Enumeration;<a name="line.7"></a>
<span class="sourceLineNo">008</span>import java.util.List;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.slf4j.Logger;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import org.slf4j.LoggerFactory;<a name="line.11"></a>
<span class="sourceLineNo">012</span><a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>public class WebcamDriverUtils {<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span>        private static final Logger LOG = LoggerFactory.getLogger(WebcamDriverUtils.class);<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>        private WebcamDriverUtils() {<a name="line.18"></a>
<span class="sourceLineNo">019</span>        }<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>        /**<a name="line.21"></a>
<span class="sourceLineNo">022</span>         * Find webcam driver. Scan packages to search drivers specified in the<a name="line.22"></a>
<span class="sourceLineNo">023</span>         * argument.<a name="line.23"></a>
<span class="sourceLineNo">024</span>         * <a name="line.24"></a>
<span class="sourceLineNo">025</span>         * @param names array of driver names to search for<a name="line.25"></a>
<span class="sourceLineNo">026</span>         * @return Driver if found or throw exception<a name="line.26"></a>
<span class="sourceLineNo">027</span>         * @throw WebcamException<a name="line.27"></a>
<span class="sourceLineNo">028</span>         */<a name="line.28"></a>
<span class="sourceLineNo">029</span>        protected static WebcamDriver findDriver(List&lt;String&gt; names, List&lt;Class&lt;?&gt;&gt; classes) {<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>                for (String name : names) {<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>                        LOG.info("Searching driver {}", name);<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>                        Class&lt;?&gt; clazz = null;<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>                        for (Class&lt;?&gt; c : classes) {<a name="line.37"></a>
<span class="sourceLineNo">038</span>                                if (c.getCanonicalName().equals(name)) {<a name="line.38"></a>
<span class="sourceLineNo">039</span>                                        clazz = c;<a name="line.39"></a>
<span class="sourceLineNo">040</span>                                        break;<a name="line.40"></a>
<span class="sourceLineNo">041</span>                                }<a name="line.41"></a>
<span class="sourceLineNo">042</span>                        }<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>                        if (clazz == null) {<a name="line.44"></a>
<span class="sourceLineNo">045</span>                                try {<a name="line.45"></a>
<span class="sourceLineNo">046</span>                                        clazz = Class.forName(name);<a name="line.46"></a>
<span class="sourceLineNo">047</span>                                } catch (ClassNotFoundException e) {<a name="line.47"></a>
<span class="sourceLineNo">048</span>                                        LOG.trace("Class not found {}, fall thru", name);<a name="line.48"></a>
<span class="sourceLineNo">049</span>                                }<a name="line.49"></a>
<span class="sourceLineNo">050</span>                        }<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span>                        if (clazz == null) {<a name="line.52"></a>
<span class="sourceLineNo">053</span>                                LOG.debug("Driver {} not found", name);<a name="line.53"></a>
<span class="sourceLineNo">054</span>                                continue;<a name="line.54"></a>
<span class="sourceLineNo">055</span>                        }<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span>                        LOG.info("Webcam driver {} has been found", name);<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>                        try {<a name="line.59"></a>
<span class="sourceLineNo">060</span>                                return (WebcamDriver) clazz.newInstance();<a name="line.60"></a>
<span class="sourceLineNo">061</span>                        } catch (InstantiationException e) {<a name="line.61"></a>
<span class="sourceLineNo">062</span>                                throw new RuntimeException(e);<a name="line.62"></a>
<span class="sourceLineNo">063</span>                        } catch (IllegalAccessException e) {<a name="line.63"></a>
<span class="sourceLineNo">064</span>                                throw new RuntimeException(e);<a name="line.64"></a>
<span class="sourceLineNo">065</span>                        }<a name="line.65"></a>
<span class="sourceLineNo">066</span>                }<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span>                return null;<a name="line.68"></a>
<span class="sourceLineNo">069</span>        }<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span>        /**<a name="line.71"></a>
<span class="sourceLineNo">072</span>         * Scans all classes accessible from the context class loader which belong<a name="line.72"></a>
<span class="sourceLineNo">073</span>         * to the given package and subpackages.<a name="line.73"></a>
<span class="sourceLineNo">074</span>         * <a name="line.74"></a>
<span class="sourceLineNo">075</span>         * @param packageName The base package<a name="line.75"></a>
<span class="sourceLineNo">076</span>         * @param flat scan only one package level, do not dive into subdirectories<a name="line.76"></a>
<span class="sourceLineNo">077</span>         * @return The classes<a name="line.77"></a>
<span class="sourceLineNo">078</span>         * @throws ClassNotFoundException<a name="line.78"></a>
<span class="sourceLineNo">079</span>         * @throws IOException<a name="line.79"></a>
<span class="sourceLineNo">080</span>         */<a name="line.80"></a>
<span class="sourceLineNo">081</span>        protected static Class&lt;?&gt;[] getClasses(String pkgname, boolean flat) {<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>                List&lt;File&gt; dirs = new ArrayList&lt;File&gt;();<a name="line.83"></a>
<span class="sourceLineNo">084</span>                List&lt;Class&lt;?&gt;&gt; classes = new ArrayList&lt;Class&lt;?&gt;&gt;();<a name="line.84"></a>
<span class="sourceLineNo">085</span><a name="line.85"></a>
<span class="sourceLineNo">086</span>                ClassLoader classLoader = Thread.currentThread().getContextClassLoader();<a name="line.86"></a>
<span class="sourceLineNo">087</span>                String path = pkgname.replace('.', '/');<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span>                Enumeration&lt;URL&gt; resources = null;<a name="line.89"></a>
<span class="sourceLineNo">090</span>                try {<a name="line.90"></a>
<span class="sourceLineNo">091</span>                        resources = classLoader.getResources(path);<a name="line.91"></a>
<span class="sourceLineNo">092</span>                } catch (IOException e) {<a name="line.92"></a>
<span class="sourceLineNo">093</span>                        throw new RuntimeException("Cannot read path " + path, e);<a name="line.93"></a>
<span class="sourceLineNo">094</span>                }<a name="line.94"></a>
<span class="sourceLineNo">095</span><a name="line.95"></a>
<span class="sourceLineNo">096</span>                while (resources.hasMoreElements()) {<a name="line.96"></a>
<span class="sourceLineNo">097</span>                        URL resource = resources.nextElement();<a name="line.97"></a>
<span class="sourceLineNo">098</span>                        dirs.add(new File(resource.getFile()));<a name="line.98"></a>
<span class="sourceLineNo">099</span>                }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span>                for (File directory : dirs) {<a name="line.101"></a>
<span class="sourceLineNo">102</span>                        try {<a name="line.102"></a>
<span class="sourceLineNo">103</span>                                classes.addAll(findClasses(directory, pkgname, flat));<a name="line.103"></a>
<span class="sourceLineNo">104</span>                        } catch (ClassNotFoundException e) {<a name="line.104"></a>
<span class="sourceLineNo">105</span>                                throw new RuntimeException("Class not found", e);<a name="line.105"></a>
<span class="sourceLineNo">106</span>                        }<a name="line.106"></a>
<span class="sourceLineNo">107</span>                }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>                return classes.toArray(new Class&lt;?&gt;[classes.size()]);<a name="line.109"></a>
<span class="sourceLineNo">110</span>        }<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span>        /**<a name="line.112"></a>
<span class="sourceLineNo">113</span>         * Recursive method used to find all classes in a given directory and<a name="line.113"></a>
<span class="sourceLineNo">114</span>         * subdirectories.<a name="line.114"></a>
<span class="sourceLineNo">115</span>         * <a name="line.115"></a>
<span class="sourceLineNo">116</span>         * @param dir base directory<a name="line.116"></a>
<span class="sourceLineNo">117</span>         * @param pkgname package name for classes found inside the base directory<a name="line.117"></a>
<span class="sourceLineNo">118</span>         * @param flat scan only one package level, do not dive into subdirectories<a name="line.118"></a>
<span class="sourceLineNo">119</span>         * @return Classes list<a name="line.119"></a>
<span class="sourceLineNo">120</span>         * @throws ClassNotFoundException<a name="line.120"></a>
<span class="sourceLineNo">121</span>         */<a name="line.121"></a>
<span class="sourceLineNo">122</span>        private static List&lt;Class&lt;?&gt;&gt; findClasses(File dir, String pkgname, boolean flat) throws ClassNotFoundException {<a name="line.122"></a>
<span class="sourceLineNo">123</span><a name="line.123"></a>
<span class="sourceLineNo">124</span>                List&lt;Class&lt;?&gt;&gt; classes = new ArrayList&lt;Class&lt;?&gt;&gt;();<a name="line.124"></a>
<span class="sourceLineNo">125</span>                if (!dir.exists()) {<a name="line.125"></a>
<span class="sourceLineNo">126</span>                        return classes;<a name="line.126"></a>
<span class="sourceLineNo">127</span>                }<a name="line.127"></a>
<span class="sourceLineNo">128</span><a name="line.128"></a>
<span class="sourceLineNo">129</span>                File[] files = dir.listFiles();<a name="line.129"></a>
<span class="sourceLineNo">130</span>                for (File file : files) {<a name="line.130"></a>
<span class="sourceLineNo">131</span>                        if (file.isDirectory() &amp;&amp; !flat) {<a name="line.131"></a>
<span class="sourceLineNo">132</span>                                classes.addAll(findClasses(file, pkgname + "." + file.getName(), flat));<a name="line.132"></a>
<span class="sourceLineNo">133</span>                        } else if (file.getName().endsWith(".class")) {<a name="line.133"></a>
<span class="sourceLineNo">134</span>                                classes.add(Class.forName(pkgname + '.' + file.getName().substring(0, file.getName().length() - 6)));<a name="line.134"></a>
<span class="sourceLineNo">135</span>                        }<a name="line.135"></a>
<span class="sourceLineNo">136</span>                }<a name="line.136"></a>
<span class="sourceLineNo">137</span><a name="line.137"></a>
<span class="sourceLineNo">138</span>                return classes;<a name="line.138"></a>
<span class="sourceLineNo">139</span>        }<a name="line.139"></a>
<span class="sourceLineNo">140</span>}<a name="line.140"></a>




























































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